LESSON ABOUT THE STELLAR EVOLUTION.pptx

STELLAR EVOLUTION

1. CHAPTER 10 STELLAR EVOLUTION ANA CARMELA ESPIRITU PRACTICE TEACHER

2. A THE BIRTH OF STARS How the stars born Table of contents C VARIABLE STARS Determine the variable of stars B PROPERTIES OF STARS Identify the basic properties of stars D STAR CLUSTERS Explore the star clusters

3. THE BIRTH OF STARS A HOW THE STARS BORN?

4. THE STAR LIFE CYCLE

5. NEBULA - is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova.

6. Nebulae are regions where new stars are beginning to form. These also called “Stellar Nurseries”. The Orion Nebula, also known as Messier 42 (or M42 for short),  is the nearest star-forming region to Earth.

7. Nebulae are made of dust and gases—mostly HYDROGEN HELIUM

8. HOW DO STARS FORM IN A NEBULA?

9. HOW DO STARS FORM IN A NEBULA? These clouds held in balance between inward force of gravity and outward pressure of gas molecules. Eventually, some disturbance overcome this balance then a quite tug of war begins. The cloud wants to dissipate(scatter) but gravity wants to pull it together.

10. HOW DO STARS FORM IN A NEBULA? Gravity crunches down the materials into a disk. The materials at the center become denser and begins to heat up. When the core temperature climbs to about 15 million degrees Celsius, nuclear fusion begins. Releasing massive amount of energy, igniting the core and setting the life of a new star.

11. AVERAGE STAR MASSIVE STAR The average star, like our own which is the Sun, turns into a white dwarf. While a massive star like Uy Cyuti , becomes either a neutron star or black hole.

12. AVERAGE STAR MASSIVE STAR The average star, like our own which is the Sun, turns into a white dwarf. While a massive star like Uy Cyuti , becomes either a neutron star or black hole.

13. BETWEEN THE AVERAGE AND MASSIVE STAR WHICH HAS A LONGER LIFESPAN?

14. Very massive stars use up their fuel quickly. This means they may only last a few hundred thousand years. Smaller stars use up fuel more slowly so will shine for several billion years. AVERAGE STAR

15. A red giant is a dying star in the final stages of stellar evolution. In about five billion years, our own  sun  will turn into a red giant, expand and engulf the inner planets — possibly even Earth.  AVERAGE STAR RED GIANT PLANETARY NEBULA DWARF STAR When a star like our Sun dies, it gently sheds its outer layers, which form a beautiful cloud called a “planetary nebula”, while the dying star's core becomes a white dwarf. The remaining core (that's 80% of the original star) is now in its final stages. The core becomes a W hite Dwarf.  The star eventually cools and dims. When it stops shining, then now dead star is called a  Black Dwarf .

16. MASSIVE STAR RED SUPER GIANT SUPERNOVA BLACK HOLE NEUTRON STAR

17. Problem Do you know what helps you make your point clear? Lists like this one: They’re simple You can organize your ideas clearly You’ll never forget to buy milk! And the most important thing: the audience won’t miss the point of your presentation

18. THE STAR LIFE CYCLE

19. PROPERTIES OF STAR B

20. The star's color is based on surface temperature: cooler stars are redder, hotter stars are bluer, mid range temperatures are white or yellow.  COLOR and TEMPERATURE

21. is a measure of the total amount of energy radiated by a star or other celestial object per second. LUMINOSITY and BRIGHTNESS

22. VARIABLE OF STAR C

23.  are those in which the change in brightness is due to some change within the star itself such as in pulsating stars like the Cepheids. INTRINSIC VARIABLE EXTRINSIC VARIABLE are those in which the light output changes due to some process external to the star itself.

24. STAR CLUSTER E

25.  loosely bound groups of a few tens to a few hundred stars. OPEN CLUSTER GLOBULAR CLUSTER densely packed collections of ancient stars. Roughly spherical in shape, they contain hundreds of thousands, and sometimes millions, of stars.

26. OPEN CLUSTER

27. GLOBULAR CLUSTER

28. STELLAR EVOLUTION THANK YOU CLASS ANA CARMELA ESPIRITU PRACTICE TEACHER